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KVM: x86: hyper-v: Honor HV_STIMER_DIRECT_MODE_AVAILABLE privilege bit

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Synthetic timers can only be configured in 'direct' mode when
HV_STIMER_DIRECT_MODE_AVAILABLE bit was exposed.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-20-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:53 +02:00 committed by Paolo Bonzini
parent d66bfa36f9
commit 1aa8a4184d
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kvm/hyperv.c
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@ -631,11 +631,17 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
union hv_stimer_config new_config = {.as_uint64 = config},
old_config = {.as_uint64 = stimer->config.as_uint64};
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
if (!synic->active && !host)
return 1;
if (unlikely(!host && hv_vcpu->enforce_cpuid && new_config.direct_mode &&
!(hv_vcpu->cpuid_cache.features_edx &
HV_STIMER_DIRECT_MODE_AVAILABLE)))
return 1;
trace_kvm_hv_stimer_set_config(hv_stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, config, host);